The attached code ( based off of netTiers v2.1.0.471 ) enables output params in a custom sprocs for a view. Before this fix you would get an exception if the sproc didn't have a default value for the output param(s), and the output params wouldn't have been picked up by netTiers.
Note I am not using Web Services so my changes there aren't tested and it's possible I may have missed something.
Also included in this is a fix in the SqlEntityProviderBase.generated.cst (described here:
http://community.codesmithtools.com/forums/thread/23463.aspx)
Hope it helps.